This page is a simple dumb upload of "The Tiny Book of Rules", containing some kind of description/documentation for the Drupal module Rules.
There are (at least) two different versions of the book – one created from a raw LibreOffice document (.odt) and one much prettier, layouted version. Check out "All files: HTTP" in the left column to see all downloadable files.
There are two layouted versions of this book:
Nice layout: http://ia600804.us.archive.org/6/items/TheTinydrupalBookOfRules/book-of-rules-v2.pdf
Nice foldable layout: http://ia600804.us.archive.org/6/items/TheTinydrupalBookOfRules/Book-of-rulesFolded.pdf